Pantograph trolley



W. SCHAAKE.

PANTOGRAPH TROLLEY.

APPLICATION FILED IEB. I5, 1919.

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Applicationiiled February 15,1919. Serial 1\l0.'277,v350.

To all whom it may concern Be itlmowni that l, WILLMM SCHAAKE, a

citizen of the United States, and a residentof `Pittsburgh, inthe county of Allegheny and State'oi' Pennsylvania, have invented a new and useful Improvement in `r-i3antograph Trolleys, of which thei'ollowing is a speciiication.

My invention relates to trolleys `and particularly to operating means for pantograph trolley frames. f

@ne object of'my inventionis tofprovide means whereby a device, of the above indicated character, may be extended andretracted at selectively predeterminedspeeds;

ifinotherobject` of my invention is to provide means whereby `a` momentary reduction in the value of the `force exerted between the pantographirame andthe `ac-` tuating meanstherefor may be automatically eected, during the actuation of the frame, in order to preventthe violent slamming of the latter, at the end ofone oiits operating movements.` i Heretofore, it has beenfusual, inthe op-- eration of certain pantograph trolley frames, to provide cushioning means, such as springs and dash pots, to arrest the momentum thereoi? at the ends oi the operationsof extending and retracting the frames but, to the best of my'linowledge, none 'of these has been entirely satisfactory. i

Further, in operating, pantogiaph frames by the usualiluid-pre'ssure cylinder and piston, one valueof operating pressure has` usually `been employed.

v In practicing my invention, `provide means whereby the inlet andfexhaust ports of afluid-pressure operatngcylinder, for 'a pantograph `frame, may be separately regulated to eiectany desired speed in the operation of extending and retracting the trame, by which means certain desirable characteristics in the raising and lowering of pantograph trolley vframes maybe 'attained I further provide means, at an intermediate peint of travel ot the operating piston, for automatically and momentarily relieving the pressure thereon, therebyreducing `the speed and the momentum of the pantograph trame and permitting it to complete its motion before being able to further accelerate to any great degree and permitting its normal :motion under fulllpressurenear the iinish ont' its travel. y

Figure l oi the accompanying drawings is a diagrammatic side view, partially in elevation land partially yinsection, of a pantograph trolley embodying my invention and indicating a locomotive or other vehicle on which `the trolley may be mounted. Figs. .2

and 3 are, respectively, an'elevation and ka side section detail view of a modified form of fluid-pressure reducing `disc embodied in my invention.

it locomotive l pivotally `supports,"yby

means lot `brackets 2 and pins orrods 3, an

extensiblepantograph frame t, of usual construction, that supports :a contact member 5 for engaging a trolley conductor 6, `The frame maybe biased toward, and `moved to,

itsextended position by springs?- extending between stationary bracketsS, disposed on thelocomotive l, and arms 9, rigidlyrelated` to the frame 4, and be retracted by c-o-op` erating links l0, levers 10,` andpistons ll `disposed. incylinders l2 connected to-a main air reservoir 13 through tubes Il having a controlling valvel.1 A member 16, attached to the .trame` 4, engages, inthe: retracted po` sition ofthe frame, a latching pawl 17 pivoted on a pin 18 and supported by a cylinder l9-that receives a supply otair tromthe reservoiri` through tubes 20 and a valve 2i. v

,Pressure reducing devices 22 and 23 are `iocated in series relation with the; tubes 14 on opposite sides of the operatin valve 15, and are ot aiusual 'andwell known construction,

each embodying a removable disc 24 having an opening` therein The `valve '15,` '1s adapted to directly connect `the cylinders l2 and the `reservoir 1B, through `both `of the devices 22 and 23, to lower the :trame i by the actionof theiiuid pressure against thepistous 11,-arms Qand links l0, against the teusion of the springs 7. `The device 22," having a smaller opening 25 through its disc 24?, controls the rate 01"' iiow ot thefluid in lowering the iframe et. i Anauxiliary reservoir 26, whichnormally contains fluid at atmospheric pressure is connected,"bytubes127, to the cylinders 1Q `at intermediate points in the paths of travel oi the pistons llland, during the operation of retracting the traine ,the arrangement permits the operating iiuid to escape from the fluid pressure `side of `the i pistons ll into the reservoir 26 and thereby momentarily reduce they operative tluid pressure'to greduce the momentum of the trame [is moved yto the lposition indicated in the:

before the latter iscompletely retracted. During this operation, after the fluid in the reservoir 26 has been compressed, the normal operating Vpressureon the piston ll will be resumed and the frame will be retracted to its linal position without violence. `In eX- tending the trame Ll, the operating valve l5 drawingsai'ter which air is admitted to the cylinder 19 byqtheoperation of the valve 2l to releasethe frame 4 which, during its ,extendin'or movement, will'move the piston l1 and eX aust the cylinders l2 through the :membery 23 and the operating valve l5 to the to be turned to, and fixed in, a position-to l ings 33 in the washer 29.'

register with any oneofvarious-sized open- `,l/Vhilefl have shown and `described-a par- `tisular.form of my invention, changes may be `effected thereinwithout departing from f the spirit and scope thereof, as lset' forth in 1 the appended claims.

' `1. In atrolley, pantograph trame', ofmeans for extending 'I' claim as my invention: i i

the combination with a 'and retracting said traine at selectively predeterminedspeeds and for momentarily reducing 'salidretracting speed during the movement of said trame. 1 i

`2. In a trolley, the combination with a pantograph trame, of iluid-actuatedmeans for 'extending and kretract-ing said trame at selectivelypredetermined speeds and for 4momentarily reducing said retracting speed before said trame reachesits limiting position. i'

3. In atrolley, the combination with a pantograph frame, of means for extending and retra'cting said frame at selectively predetermined speeds, said, means comprising ta fluid-operatedactuating mechanism for said frame, a plurality of regulating" discs 'for said mechanism yand a controlling valve located between said regulating discs for alternately` including and excluding one ot y Athe discs as an active element.

at. In` a trolley,l the combination with a pant'ographtrame, ot means for extending and retractmg said frame at selectively predetermined speeds, said means comprising a y {luid-operated actuating` mechanism for said :tramefa plurality of regulating discs for said mechanism and a controlling valve located `between said regulating discs for selectively including one of', the `discs as an active element, said regulating discs being adapted Vvtor permitting `different ratesk ot' flow ot a Huid therethrough.

- 5.`In a trolley, the combination with a pantograph frame, of meansrfor extending and retracting said frame at selectively predetermined speeds, said means comprising a fluid-actuated mechanism for said trame, a 'lluid source, a disc for regulating the flow of a fluid to said'mechanism,y audisc for regulating the flow o-aluid: from saidmechanism,fand a valve `located between saidlregulating discs for selectively controllingv said regulating discs. 1. i 'i f G. In a trolley, the combination with! a pantograph frame, of a fluid-pressure means forextendingand-retracting said frame at selectively predetermined speeds, and lluidpressure means for momentarily retarding the vmovement of said frame near the end'of one of itsmovements.l r v TQIn atrolley, the lcombination with a pantograph trame, of means for extend-ing and retracting said traine at selectively predeterininedspeeds, said means comprising a fluid-operatedactuating 'mechanism for said frame, a plurality ot adjustable regulating.

discs'for said mechanism, and a controlling valve 'tor selectively directing a fluid through said regulating discs.

8; In a trolley, the A'combination rwith a 'pantograp'li frame, ot means for extending andretracting said frame atselectively predetermined speeds, and means `for automatically changing one ofrsaid speeds momentarily at a predetermined'point in the path of movement otsaid trame.

9. In a trolley,theconibination vwith a pantograph trame, of means forv extending and retracting said frame at selectivelylpredetermined speeds, and means for: automatically 'changing one of said speedsf momentarily at a predetermined intermediate point in the path of movement of said/frame. v '10. In a trolley, the vcombination with a pantograph frame fand anfactuating cylinder.-and-piston therefor, Vof `an vactuating fluid-supply reservoir connected to said cylinder. two l series-related' regulating discs disposedbetween said reservoir and said 'cylinder, a controlling valve disposed between said regulating discs, and an auxiliary reservoir connected to said cylinder at an intermediate point inthe path of' travelot said piston to momentarily relieve the pressure upon said piston and lthereby serve as retarding means -in the movementrof said 'trama 11. In al trolley, theic'ombinati'on with a pantograph frame, of means for extending and retracting said frame, and means for automatically changing the rate of travel of said frame momentarily at an intermediate stage of one of said movements.

l2. ln a trolley, the combination With a pantograph frame of fluid-pressure means foi* extending and retracting said frame, and a means for automatically reducing the fluid pressure at an intermediate stage of one of said movements.

13. In a trolley, the combination with a pantograph iframe of iiuid-pressure means for extending and retracting said frame, and automatic means for temporaily reducing the fluid pressure at an intermediate Stage of one of said movements.

ln testimony whereof. l have hereunto subscribed my name this 31st day of Jan.,

WILLIAM SCHAAKE. 

